railway RRB Group D Mock Test Series 2024-25 General Science Physics Wave

শূন্যস্থানে আলোর বেগ কত?

1
3 x 1010  মি/সেকেন্ড 
2
3 x 108  মি/সেকেন্ড 
3
2 x 108  মি/সেকেন্ড 
4
2.25 x 108  মি/সেকেন্ড 
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